Colorectal Surgery Practice Questions

Q: Which of the following is a known complication of a stoma (e.g., colostomy)?

All of the above. ### Explanation Stoma complications are a high-yield topic in surgical exams, categorized into **early** (within 30 days) and **late** (after 30 days) complications. The correct answer is **D (All of the above)** because prolapse, stenosis, and retraction are well-documented sequelae of stoma formation. * **Prolapse (Option A):** This is a late complication where the bowel protrudes through the stoma site. It is more common in loop colostomies than end stomas. It occurs due to an oversized fascial opening or increased intra-abdominal pressure. * **Stenosis (Option B):** This refers to the narrowing of the stoma outlet. It often results from chronic ischemia, peristomal skin infections, or excessive scarring during healing. It can lead to obstructive symptoms. * **Retraction (Option C):** This occurs when the stoma sinks below the skin level. It is often caused by excessive tension on the bowel limb, poor mobilization of the mesentery, or weight gain (increased subcutaneous fat). It leads to poor appliance fitting and skin excoriation. **Clinical Pearls for NEET-PG:** * **Most common early complication:** Skin excoriation/dermatitis (due to leakage). * **Most common late complication:** Parastomal hernia. * **Necrosis:** Usually occurs within the first 24 hours due to compromised blood supply; if it extends below the fascial level, immediate re-operation is required. * **Ideal Stoma Site:** Should be placed through the **rectus abdominis muscle** to reduce the risk of herniation and away from bony prominences or skin folds.

Q: Carcinoma of the right colon commonly presents as:

Fungating lesion. **Explanation:** Carcinoma of the colon exhibits distinct morphological patterns depending on its anatomical location. This difference is primarily due to the embryological origin and the diameter of the bowel lumen. **1. Why "Fungating lesion" is correct:** The **right colon** (caecum and ascending colon) has a large diameter and thin, distensible walls. Additionally, the fecal matter here is liquid. Because there is ample space, tumors tend to grow as large, **exophytic, cauliflower-like, or fungating masses** that protrude into the lumen. These lesions often bleed chronically, leading to iron deficiency anemia, but rarely cause early obstruction. **2. Why the other options are incorrect:** * **Stenosing/Infiltrating lesions:** These are characteristic of the **left colon** (descending and sigmoid colon). The left colon has a narrower lumen and thicker walls. Tumors here tend to grow circumferentially (annular growth), leading to the classic "napkin-ring" appearance and early intestinal obstruction. * **Ulcerating lesion:** While any colorectal cancer can ulcerate and bleed, it is not the primary morphological description used to differentiate right-sided from left-sided growths in standard surgical pathology. **Clinical Pearls for NEET-PG:** * **Right-sided growth:** Presents with **Anemia** (occult blood loss), palpable mass in the right iliac fossa, and weight loss. * **Left-sided growth:** Presents with **altered bowel habits** (constipation/diarrhea) and features of intestinal obstruction. * **Most common site:** Historically the rectum, but there is a shifting trend toward the proximal colon (Right-sided shift). * **Investigation of choice:** Colonoscopy with biopsy. * **Tumor Marker:** CEA (primarily used for monitoring recurrence, not screening).

Q: A sentinel pile indicates:

Anal fissure. **Explanation:** A **sentinel pile** (also known as a skin tag) is a characteristic clinical feature of a **chronic anal fissure**. It is a hypertrophied skin tag located at the distal end of the fissure. **Why Anal Fissure is Correct:** An anal fissure is a longitudinal tear in the anoderm, most commonly located in the posterior midline. In the chronic stage (usually >6 weeks), constant irritation and low-grade inflammation lead to secondary changes: 1. **Sentinel Pile:** Edematous skin tag at the lower end. 2. **Hypertrophied Anal Papilla:** Located at the upper end (proximal) of the fissure. 3. **Exposed Sphincter Fibers:** The circular fibers of the internal anal sphincter become visible at the base of the ulcer. **Why Other Options are Incorrect:** * **Carcinoma of the rectum:** Typically presents with altered bowel habits, tenesmus, and bleeding per rectum; it does not produce a sentinel tag. * **Internal hemorrhoids:** These are vascular cushions that prolapse. While they may cause bleeding, they are usually painless (unless thrombosed) and do not feature a sentinel pile. * **Perianal fistula:** Characterized by an external opening on the perineal skin discharging pus or flatus, rather than a solid skin tag at the anal verge. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** 90% of fissures are **posterior midline**. If a fissure is lateral, suspect systemic conditions like Crohn’s disease, TB, or HIV. * **Pathophysiology:** Associated with internal anal sphincter hypertonia and ischemia. * **Management:** The "Gold Standard" surgical treatment is **Lateral Internal Sphincterotomy (LIS)**. First-line medical management includes sitz baths, high-fiber diet, and topical nitrates (Glyceryl Trinitrate) or Calcium Channel Blockers (Diltiazem).

Q: All of the following are true about Gardner's Syndrome except:

Polyps rarely undergo malignant transformation.. **Explanation:** Gardner’s Syndrome is a phenotypic variant of **Familial Adenomatous Polyposis (FAP)**. The hallmark of this condition is the development of hundreds to thousands of adenomatous colorectal polyps due to a mutation in the **APC gene** on chromosome 5q21. **1. Why Option D is the Correct Answer (The False Statement):** The polyps in Gardner’s Syndrome are **adenomatous**, not hamartomatous. These polyps have a **100% risk of malignant transformation** into colorectal cancer, usually by age 40, if a prophylactic total proctocolectomy is not performed. Therefore, stating they "rarely undergo malignant transformation" is clinically incorrect. **2. Analysis of Other Options:** * **Option A (Autosomal Dominant):** Gardner’s Syndrome follows an autosomal dominant inheritance pattern, consistent with FAP. * **Option B (Sebaceous Cysts):** Extra-intestinal manifestations are a key feature of Gardner’s. These include **sebaceous (epidermoid) cysts**, lipomas, and fibromas. * **Option C (Duodenal Polyps):** While the primary site is the colon, patients frequently develop polyps in the **duodenum** (specifically periampullary adenomas), which are the second most common site of malignancy in these patients. **Clinical Pearls for NEET-PG:** * **The Triad of Gardner’s:** Colonic polyposis, Osteomas (usually of the mandible/skull), and Soft tissue tumors (epidermoid cysts, desmoid tumors). * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a highly specific bedside screening marker for FAP/Gardner’s. * **Turcot Syndrome:** Another FAP variant associated with CNS tumors (Medulloblastoma). * **Management:** Gold standard is prophylactic surgery (IPAA - Ileal Pouch-Anal Anastomosis).

Q: A 22-year-old male presents with a family history of colorectal adenocarcinoma in his father. What is a possible diagnosis given this information?

Gardner's syndrome. **Explanation:** The clinical presentation of a young patient with a strong family history of colorectal adenocarcinoma points toward an **Autosomal Dominant** polyposis syndrome, most commonly **Familial Adenomatous Polyposis (FAP)** or its variants. **Gardner’s Syndrome (Option D)** is a phenotypic variant of FAP caused by a mutation in the **APC gene** on chromosome 5q21. It is characterized by the triad of: 1. **Colonic Polyposis:** Hundreds to thousands of adenomatous polyps with a 100% risk of progression to adenocarcinoma if left untreated. 2. **Soft Tissue Tumors:** Epidermoid cysts, fibromas, and desmoid tumors. 3. **Bone Tumors:** Osteomas (typically of the mandible or skull). **Why other options are incorrect:** * **Turcot Syndrome (Option A):** Also a variant of FAP/HNPCC, but it is specifically associated with **Central Nervous System (CNS) tumors** (e.g., medulloblastoma or glioblastoma) rather than the extra-colonic manifestations described in Gardner's. * **Peutz-Jeghers Syndrome (Option B):** Characterized by **hamartomatous polyps** and mucocutaneous hyperpigmentation. While it increases cancer risk, it is not the classic diagnosis for a young patient presenting with a primary family history of early-onset adenocarcinoma in this context. * **Cowden’s Disease (Option C):** Part of the PTEN Hamartoma Tumor Syndrome. It features multiple hamartomas and carries a high risk of breast, thyroid, and endometrial cancers, but is less commonly associated with early-onset colorectal adenocarcinoma compared to FAP variants. **High-Yield NEET-PG Pearls:** * **CHRPE** (Congenital Hypertrophy of Retinal Pigment Epithelium) is the earliest extra-colonic sign of FAP/Gardner’s. * **Desmoid tumors** are a significant cause of morbidity in Gardner’s syndrome post-colectomy. * The standard treatment for FAP/Gardner's is **Proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA)**.

Q: What is the treatment of choice for fistula in ano?

Fistulotomy. **Explanation:** The primary goal in treating a fistula-in-ano is to eradicate the track while preserving anal sphincter function. **Why Fistulotomy is the Correct Answer:** **Fistulotomy** is considered the gold standard and treatment of choice for simple (low-lying) fistulae. It involves laying the track open by cutting the overlying skin and muscle, allowing the wound to heal by secondary intention from the base upwards. It has a high success rate and a lower risk of sphincter damage compared to more invasive procedures. **Analysis of Incorrect Options:** * **Anal Dilatation (Lord’s Procedure):** This is used historically for hemorrhoids or anal fissures, not for fistulae. It carries a high risk of fecal incontinence. * **Fissurotomy:** This is the surgical treatment for a chronic anal fissure, involving the excision of the fissure and its sentinel pile. * **Fistulectomy:** This involves the complete excision of the entire fistula track. While effective, it creates a larger wound, takes longer to heal, and carries a significantly **higher risk of damaging the anal sphincter**, leading to incontinence. Therefore, fistulotomy is preferred over fistulectomy. **Clinical Pearls for NEET-PG:** * **Goodsall’s Rule:** Predicts the track of the fistula. If the external opening is **anterior** to a transverse line through the anus, the track is straight. If **posterior**, the track is curved and opens in the midline. (Exception: Anterior openings >3cm from the anus follow the posterior rule). * **Park’s Classification:** Categorizes fistulae into Intersphincteric (most common), Transsphincteric, Suprasphincteric, and Extrasphincteric. * **Seton Placement:** Used for "complex" or high fistulae where a primary fistulotomy would risk major incontinence. * **Most common cause:** Cryptoglandular infection (infection of the anal glands).

Question 1

A 70-year-old male presents with a history of lower gastrointestinal bleeding for the last six months. Sigmoidoscopic examination reveals a 4 cm mass located 3.5 cm above the anal verge. What is the treatment of choice?

Accepted Answer

Abdominoperineal resection

Answer

Colostomy

Answer

Anterior resection

Answer

Defunctioning anastomosis

Question 2

Which of the following is a known complication of a stoma (e.g., colostomy)?

Accepted Answer

All of the above

Answer

Prolapse

Answer

Stenosis

Answer

Retraction

Question 3

Carcinoma of the right colon commonly presents as:

Accepted Answer

Fungating lesion

Answer

Ulcerating lesion

Answer

Stenosing lesion

Answer

Infiltrating lesion

Question 4

A sentinel pile indicates:

Accepted Answer

Anal fissure

Answer

Carcinoma of the rectum

Answer

Internal hemorrhoids

Answer

Perianal fistula

Question 5

What is the recommended margin of clearance for anal carcinoma?

Accepted Answer

2 cm

Answer

3 cm

Answer

4 cm

Answer

5 cm

Question 6

All of the following are true about Gardner's Syndrome except:

Accepted Answer

Polyps rarely undergo malignant transformation.

Answer

Autosomal dominant inheritance.

Answer

Associated sebaceous cysts are seen.

Answer

Development of hamartomatous polyps in the duodenum.

Question 7

Full bowel preparation is avoided in which of the following conditions?

Accepted Answer

Carcinoma of the colon

Answer

Hirschsprung disease

Answer

Ulcerative colitis

Answer

Irritable bowel syndrome

Question 8

A 22-year-old male presents with a family history of colorectal adenocarcinoma in his father. What is a possible diagnosis given this information?

Accepted Answer

Gardner's syndrome

Answer

Turcot syndrome

Answer

Peutz-Jeghers syndrome

Answer

Cowden's disease

Question 9

What is the most likely cause for suture leak after colon resection and anastomosis for sigmoid cancer?

Accepted Answer

Ischemia

Answer

Subclinical malnutrition

Answer

Infection of the anastomotic site

Answer

Mechanical disruption due to colonic pressure and contractility

Question 10

What is the treatment of choice for fistula in ano?

Accepted Answer

Fistulotomy

Answer

Anal dilatation

Answer

Fissurotomy

Answer

Fistulectomy

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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